<template>
  <div class="detail">
    <Header/>
    <div class="main">
      <div class="course-info">
        <div class="wrap-left">
          <video-player class="video-player vjs-custom-skin"
                        ref="videoPlayer"
                        :playsinline="true"
                        :options="playerOptions"
                        @play="onPlayerPlay($event)"
                        @pause="onPlayerPause($event)"
          >
          </video-player>
        </div>
        <div class="wrap-right">
          <h3 class="course-name">{{course.name}}</h3>
          <p class="data">{{course.students}}人在学&nbsp;&nbsp;&nbsp;&nbsp;课程总时长：{{course.lessons}}课时/{{course.lessons==course.pub_lessons?'更新完成':('已更新'+course.pub_lessons+"课程")}}&nbsp;&nbsp;&nbsp;&nbsp;难度：{{course.course_level}}</p>
          <div v-if="course.get_course_discount_type">
            <div class="sale-time">
              <p class="sale-type">{{course.get_course_discount_type}}</p>
              <p class="expire">
                距离结束：仅剩
                {{Math.floor(course.has_time/86400)}}天
                {{Math.floor(course.has_time%86400/3600)}}小时
                {{Math.floor(course.has_time%86400%3600/60)}}分
                <span class="second">{{Math.floor(course.has_time%86400%3600%60)}}</span> 秒</p>
            </div>
            <p class="course-price">
              <span>活动价</span>
              <span class="discount">¥{{course.get_course_price.toFixed(2)}}</span>
              <span class="original">¥{{course.price}}</span>
            </p>
          </div>
          <div v-else>
            <div class="sale-time">
              <p class="sale-type">价格：￥{{course.price}}</p>
            </div>
          </div>
          <div class="buy">
            <div class="buy-btn">
              <button class="buy-now" @click="buynow">立即购买</button>
              <button class="free">免费试学</button>
            </div>
            <div class="add-cart" @click="cartAddHander"><img src="@/assets/cart-yellow.svg" alt="">加入购物车</div>
          </div>
        </div>
      </div>
      <div class="course-tab">
        <ul class="tab-list">
          <li :class="tabIndex==1?'active':''" @click="tabIndex=1">详情介绍</li>
          <li :class="tabIndex==2?'active':''" @click="tabIndex=2">课程章节 <span :class="tabIndex!=2?'free':''">(试学)</span>
          </li>
          <li :class="tabIndex==3?'active':''" @click="tabIndex=3">用户评论 (0)</li>
          <li :class="tabIndex==4?'active':''" @click="tabIndex=4">常见问题</li>
        </ul>
      </div>
      <div class="course-content">
        <div class="course-tab-list">
          <div class="tab-item" v-if="tabIndex==1">
            <div v-html="course.brief"></div>
          </div>
          <div class="tab-item" v-if="tabIndex==2">
            <div class="tab-item-title">
              <p class="chapter">课程章节</p>
              <p class="chapter-length">共{{chapter_list.length}}章 {{lesson_length}}个课时</p>
            </div>
            <div class="chapter-item" v-for="chapter in chapter_list">
              <p class="chapter-title"><img src="@/assets/1.svg" alt="">第{{chapter.chapter}}章·{{chapter.name}}</p>
              <ul class="lesson-list">
                <li class="lesson-item" v-for="lesson in chapter.coursesections">
                  <p class="name"><span class="index">{{chapter.chapter}}-{{lesson.id}}</span> {{lesson.name}}<span
                    class="free" v-if="lesson.free_trail">免费</span></p>
                  <p class="time">{{lesson.duration}} <img src="@/assets/chapter-player.svg"></p>
                  <button class="try" v-if="lesson.free_trail">
                    <router-link :to="{path:'/player',query:{'vid':lesson.section_link}}">立即试学</router-link>
                  </button>
                  <button class="try" v-else>立即购买</button>
                </li>

              </ul>
            </div>
          </div>
          <div class="tab-item" v-if="tabIndex==3">
            用户评论
          </div>
          <div class="tab-item" v-if="tabIndex==4">
            常见问题
          </div>
        </div>
        <div class="course-side">
          <div class="teacher-info">
            <h4 class="side-title"><span>授课老师</span></h4>
            <div class="teacher-content">
              <div class="cont1">
                <img :src="course.teacher.image">
                <div class="name">
                  <p class="teacher-name">{{course.teacher.name}} {{course.teacher.title}}</p>
                  <p class="teacher-title">{{course.teacher.signature}}</p>
                </div>
              </div>
              <p class="narrative">{{course.teacher.brief}}</p>
            </div>
          </div>
        </div>
      </div>
    </div>
    <Footer/>
  </div>
</template>

<script>
  import Header from "./common/Header"
  import Footer from "./common/Footer"
  import {videoPlayer} from 'vue-video-player';

  export default {
    name: 'Detail',
    data() {
      return {
        // token: sessionStorage.token || localStorage.token,
        // user_id: sessionStorage.id || localStorage.id,
        // user_name: sessionStorage.username || localStorage.username,
        tabIndex: 1,  // 当前选项卡显示的下标
        course_id: 0, // 当前页面对应的课程ID
        course: {
          teacher: {},
        },  // 课程详情信息
        chapter_list: {},
        playerOptions: {
          playbackRates: [0.7, 1.0, 1.5, 2.0], // 播放速度
          autoplay: false, //如果true,则自动播放
          muted: false, // 默认情况下将会消除任何音频。
          loop: false, // 循环播放
          preload: 'auto',  // 建议浏览器在<video>加载元素后是否应该开始下载视频数据。auto浏览器选择最佳行为,立即开始加载视频（如果浏览器支持）
          language: 'zh-CN',
          aspectRatio: '16:9', // 将播放器置于流畅模式，并在计算播放器的动态大小时使用该值。值应该代表一个比例 - 用冒号分隔的两个数字（例如"16:9"或"4:3"）
          fluid: true, // 当true时，Video.js player将拥有流体大小。换句话说，它将按比例缩放以适应其容器。
          sources: [{ // 播放资源和资源格式
            type: "video/mp4",
            src: "http://img.ksbbs.com/asset/Mon_1703/05cacb4e02f9d9e.mp4" //你的视频地址（必填）
          }],
          poster: "", //视频封面图
          width: document.documentElement.clientWidth, // 默认视频全屏时的最大宽度
          notSupportedMessage: '此视频暂无法播放，请稍后再试', //允许覆盖Video.js无法播放媒体源时显示的默认信息。
        },
        lesson_length: 0,
      }
    },
    watch: {
      course(data) {
        // this.playerOptions.sources[0].src = data.video;
        this.playerOptions.poster = data.course_img;
        while (data.brief.search(`"/media`) != -1) {
          data.brief = data.brief.replace(`"/media`, `"${this.$settings.Host}/media`)
        }
      },
      tabIndex(data) {
        if (data == 2) {
          //获取当前课程对应的章节列表和课时列表
          this.$axios.get(`${this.$settings.Host}/courses/chapters/?course=${this.course_id}`).then(response => {
            this.chapter_list = response.data;
            this.chapter_list.forEach(chapter => {
              chapter.coursesections.forEach(lesson => {
                this.lesson_length += 1
              })
            })
          }).catch(error => {
            console.log(error.response)
          })
        }
      }
    },
    components: {
      Header,
      Footer,
      videoPlayer,
    },
    methods: {
      // 视频播放事件
      onPlayerPlay(player) {
        // alert("play");
      },
      // 视频暂停播放事件
      onPlayerPause(player) {
        // alert("pause");
      },
      // 视频插件初始化
      player() {
        return this.$refs.videoPlayer.player;
      },
      cartAddHander() {
        // let token = sessionStorage.token || localStorage.token;
        if (!(sessionStorage.token || localStorage.token)) {
          this.$confirm('对不起，您尚未登录！请登录', '提示').then(() => {
            this.$router.push('/login');
          }).catch(() => {
          });
          return;

        }
        this.$axios.post(this.$settings.Host + `/cart/course/`, {
          course_id: this.course_id,
        }, {
          headers: {
            // 'Authorization': 'jwt ' + this.token
            'Authorization': 'jwt ' + (sessionStorage.token || localStorage.token)
          },
        }).then(response => {
          this.$store.state.cart.count = response.data.count;
          // this.$store.commit('addcart', response.data);
          this.$message({
            duration: 1000,
            showClose: true,
            message: response.data.message,
            type: 'success',
          })
        }).catch(error => {
          console.log(error.response);
        })
      },
      buynow() {
        this.cartAddHander();
        this.$axios.post(this.$settings.Host + '/orders/', {}, {
          headers: {
            'Authorization': 'jwt ' + (sessionStorage.token || localStorage.token)
          }
        }).then(response => {
          this.$message(response.data.message, '提示', {
        });
           this.$router.push(`/orders/${response.data.order}`)
        }).catch(error => {
          console.log(error.response)
        });

      }
    },
    created() {

      let id = Number(this.$route.query.id);
      this.course_id = id;
      let _this = this;
      if (isNaN(id) || id < 1) {
        _this.$alert('无效的课程ID！', '错误', {
          callback() {
            _this.$router.go(-1);
          }
        });
      }
      this.$axios.get(this.$settings.Host + `/courses/detail/${this.course_id}/`).then(response => {
        this.course = response.data;
        this.playerOptions.poster = this.course.course_img;
        let _this = this;
        if (this.course.has_time > 0) {
          let timer = setInterval(() => {
            if (this.course.has_time > 1) {
              this.course.has_time -= 1;
            } else {
              clearInterval(timer);
              _this.$axios.get(this.$settings.Host + `/courses/detail/${this.course_id}/`).then(response => {
                _this.course = response.data;
                _this.playerOptions.poster = _this.course.course_img;
              }).catch(error => {
                console.log(error.response)
              });
              // location.reload();
            }
          }, 1000);
        }
      }).catch(error => {
        console.log(error.response)
      });

    },
  };
</script>

<style scoped>
  .main {
    background: #fff;
    padding-top: 30px;
  }

  .course-info {
    width: 1200px;
    margin: 0 auto;
    overflow: hidden;
  }

  .wrap-left {
    float: left;
    width: 690px;
    height: 388px;
    background-color: #000;
  }

  .wrap-right {
    float: left;
    position: relative;
    height: 388px;
  }

  .course-name {
    font-size: 20px;
    color: #333;
    padding: 10px 23px;
    letter-spacing: .45px;
  }

  .data {
    padding-left: 23px;
    padding-right: 23px;
    padding-bottom: 16px;
    font-size: 14px;
    color: #9b9b9b;
  }

  .sale-time {
    width: 464px;
    background: #fa6240;
    font-size: 14px;
    color: #4a4a4a;
    padding: 10px 23px;
    overflow: hidden;
  }

  .sale-type {
    font-size: 16px;
    color: #fff;
    letter-spacing: .36px;
    float: left;
  }

  .sale-time .expire {
    font-size: 14px;
    color: #fff;
    float: right;
  }

  .sale-time .expire .second {
    width: 24px;
    display: inline-block;
    background: #fafafa;
    color: #5e5e5e;
    padding: 6px 0;
    text-align: center;
  }

  .course-price {
    background: #fff;
    font-size: 14px;
    color: #4a4a4a;
    padding: 5px 23px;
  }

  .discount {
    font-size: 26px;
    color: #fa6240;
    margin-left: 10px;
    display: inline-block;
    margin-bottom: -5px;
  }

  .original {
    font-size: 14px;
    color: #9b9b9b;
    margin-left: 10px;
    text-decoration: line-through;
  }

  .buy {
    width: 464px;
    padding: 0px 23px;
    position: absolute;
    left: 0;
    bottom: 20px;
    overflow: hidden;
  }

  .buy .buy-btn {
    float: left;
  }

  .buy .buy-now {
    width: 125px;
    height: 40px;
    border: 0;
    background: #ffc210;
    border-radius: 4px;
    color: #fff;
    cursor: pointer;
    margin-right: 15px;
    outline: none;
  }

  .buy .free {
    width: 125px;
    height: 40px;
    border-radius: 4px;
    cursor: pointer;
    margin-right: 15px;
    background: #fff;
    color: #ffc210;
    border: 1px solid #ffc210;
  }

  .add-cart {
    float: right;
    font-size: 14px;
    color: #ffc210;
    text-align: center;
    cursor: pointer;
    margin-top: 10px;
  }

  .add-cart img {
    width: 20px;
    height: 18px;
    margin-right: 7px;
    vertical-align: middle;
  }

  .course-tab {
    width: 100%;
    background: #fff;
    margin-bottom: 30px;
    box-shadow: 0 2px 4px 0 #f0f0f0;

  }

  .course-tab .tab-list {
    width: 1200px;
    margin: auto;
    color: #4a4a4a;
    overflow: hidden;
  }

  .tab-list li {
    float: left;
    margin-right: 15px;
    padding: 26px 20px 16px;
    font-size: 17px;
    cursor: pointer;
  }

  .tab-list .active {
    color: #ffc210;
    border-bottom: 2px solid #ffc210;
  }

  .tab-list .free {
    color: #fb7c55;
  }

  .course-content {
    width: 1200px;
    margin: 0 auto;
    background: #FAFAFA;
    overflow: hidden;
    padding-bottom: 40px;
  }

  .course-tab-list {
    width: 880px;
    height: auto;
    padding: 20px;
    background: #fff;
    float: left;
    box-sizing: border-box;
    overflow: hidden;
    position: relative;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }

  .tab-item {
    width: 880px;
    background: #fff;
    padding-bottom: 20px;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }

  .tab-item-title {
    justify-content: space-between;
    padding: 25px 20px 11px;
    border-radius: 4px;
    margin-bottom: 20px;
    border-bottom: 1px solid #333;
    border-bottom-color: rgba(51, 51, 51, .05);
    overflow: hidden;
  }

  .chapter {
    font-size: 17px;
    color: #4a4a4a;
    float: left;
  }

  .chapter-length {
    float: right;
    font-size: 14px;
    color: #9b9b9b;
    letter-spacing: .19px;
  }

  .chapter-title {
    font-size: 16px;
    color: #4a4a4a;
    letter-spacing: .26px;
    padding: 12px;
    background: #eee;
    border-radius: 2px;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
  }

  .chapter-title img {
    width: 18px;
    height: 18px;
    margin-right: 7px;
    vertical-align: middle;
  }

  .lesson-list {
    padding: 0 20px;
  }

  .lesson-list .lesson-item {
    padding: 15px 20px 15px 36px;
    cursor: pointer;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
  }

  .lesson-item .name {
    font-size: 14px;
    color: #666;
    float: left;
  }

  .lesson-item .index {
    margin-right: 5px;
  }

  .lesson-item .free {
    font-size: 12px;
    color: #fff;
    letter-spacing: .19px;
    background: #ffc210;
    border-radius: 100px;
    padding: 1px 9px;
    margin-left: 10px;
  }

  .lesson-item .time {
    font-size: 14px;
    color: #666;
    letter-spacing: .23px;
    opacity: 1;
    transition: all .15s ease-in-out;
    float: right;
  }

  .lesson-item .time img {
    width: 18px;
    height: 18px;
    margin-left: 15px;
    vertical-align: text-bottom;
  }

  .lesson-item .try {
    width: 86px;
    height: 28px;
    background: #ffc210;
    border-radius: 4px;
    font-size: 14px;
    color: #fff;
    position: absolute;
    right: 20px;
    top: 10px;
    opacity: 0;
    transition: all .2s ease-in-out;
    cursor: pointer;
    outline: none;
    border: none;
  }

  .lesson-item:hover {
    background: #fcf7ef;
    box-shadow: 0 0 0 0 #f3f3f3;
  }

  .lesson-item:hover .name {
    color: #333;
  }

  .lesson-item:hover .try {
    opacity: 1;
  }

  .course-side {
    width: 300px;
    height: auto;
    margin-left: 20px;
    float: right;
  }

  .teacher-info {
    background: #fff;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }

  .side-title {
    font-weight: normal;
    font-size: 17px;
    color: #4a4a4a;
    padding: 18px 14px;
    border-bottom: 1px solid #333;
    border-bottom-color: rgba(51, 51, 51, .05);
  }

  .side-title span {
    display: inline-block;
    border-left: 2px solid #ffc210;
    padding-left: 12px;
  }

  .teacher-content {
    padding: 30px 20px;
    box-sizing: border-box;
  }

  .teacher-content .cont1 {
    margin-bottom: 12px;
    overflow: hidden;
  }

  .teacher-content .cont1 img {
    width: 54px;
    height: 54px;
    margin-right: 12px;
    float: left;
  }

  .teacher-content .cont1 .name {
    float: right;
  }

  .teacher-content .cont1 .teacher-name {
    width: 188px;
    font-size: 16px;
    color: #4a4a4a;
    padding-bottom: 4px;
  }

  .teacher-content .cont1 .teacher-title {
    width: 188px;
    font-size: 13px;
    color: #9b9b9b;
    white-space: nowrap;
  }

  .teacher-content .narrative {
    font-size: 14px;
    color: #666;
    line-height: 24px;
  }
</style>
